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Emission of Protons in Inelastic Nucleus-Nucleus Collisions at High Energy

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Chinese journal of nuclear physics 1995年第4期17卷 292-297页

作者： liu, fuhu Shanxi Teachers Univ Linfen China

Based on the participant-spectator model and the analysis of particle producing proce-ss, the rapidity distribution and the noninvariant center-of-mass energy spectrum of final pro-tons produced in inelastic nucleus-n... 详细信息

关键词： Nucleus-nucleus collisions Final protons Rapidity distribution Noninvariant c.m. energy spectrum

Final-State Energy Spectrum in Nuclear Electromagnetic Dissociation Process

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Chinese journal of nuclear physics 1997年第3期19卷 155-158页

作者： liu, fuhu Shanxi Teachers' Univ Linfen China

The final-state energy spectrum in the electromagnetic dissociation is calculated by asimple *** final-state energy curves obtained from the calculation are in agreementwith the experimental data of 28Si into p+27Al a... 详细信息

关键词： Final-state energy Electromagnetic dissociation Nucleus-nucleus collisions

Multiplicity Distribution of Evaporated Fragments in Relativistic Nucleus-Nucleus Collisions

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Chinese journal of nuclear physics 1995年第1期17卷 17-20页

作者： liu, fuhu Inst of High Energy Physics Chinese Acad of Sciences Beijing China

The multiplicity distribtuion of evaporated fragments in relativistic nucleus-nucleus collisions are *** calculated results are in agreement with the exper-imental data in the energy range from 3.7 to 200 GeV/N.

关键词： Relativistic nucleus-nucleus collisions Evaporated fragment, Multiplicity distribution

Investigation of Evaporated Fragments in Intermediate Energy Heavy Ion Collisions

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Chinese journal of nuclear physics 1997年第4期19卷 216-219页

作者： liu, fuhu Zhang, Jinjun Shanxi Teachers' Univ Linfen China

The reactions induced by intermediate energy heavy ions are *** evap-orated fragment multiplicity and excitation energy distributions are calculated and comparedwith the experimental data of the reaction Ar+Ag at 50 a... 详细信息

关键词： Intermediate energy heavy ion Collisions Evaporated fragment Multiplicity Excitation energy

Hot Nuclei Multifragmentation and Cascade Partition Method

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Chinese journal of nuclear physics 1995年第3期17卷 200-204页

作者： liu, fuhu Inst of High Energy Physics Chinese Acad of Sciences Beijing China

The conditional moment correlation and distribution are calculated by a self-similarity cascadepartition *** results calculated are in agreernent with the experimental data of 3.7 and 14.6GeV/u 28Si fragmentation in n... 详细信息

关键词： Multifragmentation Conditional moments Cascade partition method

基于机器学习从逐事件重离子碰撞提取物理信息

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原子能科学技术 2023年第4期57卷 774-783页

作者：魏国俊王永佳李庆峰刘福虎山西大学理论物理研究所山西太原030006 湖州师范学院理学院浙江湖州313000

在重离子碰撞实验和输运模型模拟中均可逐事件获取观测量数据,然而,利用重离子碰撞研究核物质性质时通常只使用观测量对所有事件的平均值。机器学习拥有强大的数据分析和处理能力,可有效利用逐事件观测量数据中包含的丰富信息。本文通... 详细信息

在重离子碰撞实验和输运模型模拟中均可逐事件获取观测量数据,然而,利用重离子碰撞研究核物质性质时通常只使用观测量对所有事件的平均值。机器学习拥有强大的数据分析和处理能力,可有效利用逐事件观测量数据中包含的丰富信息。本文通过极端相对论量子分子动力学(UrQMD)模型和机器学习算法的结合,为相关问题的研究提供新途径。研究结果显示,机器学习方法可从逐事件的观测量数据中提取关键物理参数的信息。此外,利用机器学习中特征量重要性归因方法,还可找出对提取相关参数最重要的特征量,从而对研究这些问题提供有价值的参考。

关键词：机器学习重离子碰撞逐事件

维普期刊数据库博看期刊

A Calculation of Excitation Energy of Spectator in Relativistic Nucleus-Nucleus Collisions

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Chinese journal of nuclear physics 1997年第2期 77-80页

作者： liu fuhu Department of Physics,Shanxi Teachers’ University,Linfen 041004

The excited degree of spectator in relativistic nucleus-nucleus collisions is *** heat of friction due to the relative motion beween the participant and the spectatorand the superfluous surface energy due to the spect... 详细信息

关键词： Relativistic nucleus-nucleus collisions Spectator Excitation energy Heat of friction Superfluous surface energy

Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

Ti预处理的SiC_(f)/SiC与镍基高温合金复合铸件的界面组织与强度

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材料工程 2024年第2期52卷 164-171页

作者：林国标朱付虎赵斯文北京科技大学材料科学与工程学院北京100083

由SiC_(f)/SiC复合材料与K403镍基高温合金熔体制备的一体化铸件,冷却到室温时会出现自行断裂。通过采用Ti粉埋覆包渗工艺在1100℃下对SiC_(f)/SiC表面进行预处理,并在适当工艺下与K403镍基高温合金熔体进行陶瓷型精密铸造,成功实现SiC_... 详细信息

由SiC_(f)/SiC复合材料与K403镍基高温合金熔体制备的一体化铸件,冷却到室温时会出现自行断裂。通过采用Ti粉埋覆包渗工艺在1100℃下对SiC_(f)/SiC表面进行预处理,并在适当工艺下与K403镍基高温合金熔体进行陶瓷型精密铸造,成功实现SiC_(f)/SiC与K403镍基高温合金的一体化成形和界面的牢固结合。结果表明:Ti预处理层平均厚度为17μm左右,Ti向SiC_(f)/SiC渗透、扩散和反应,形成含TiC,Ti3SiC2,Ti5Si3Cx,SiC相的显微组织;经过与高温镍基金属液复合铸造后,预处理层演变成厚约120μm的界面反应层,其典型界面组织为Ni2Si+C+Al4C3+MC(M主要含Ti及少量的Cr,Mo,W)。预处理层的存在减轻Ni与SiC的有害石墨化反应,缓解高温金属液对SiC_(f)/SiC的热冲击,形成的界面反应层降低热膨胀系数失配造成的热应力,使得SiC_(f)/SiC与K403一体化铸件结合界面的室温剪切强度达到63.5 MPa。

关键词： SiC_(f)/SiC K403 镍基高温合金一体化铸造复合铸造 Ti预处理层